EP1394561A1 - Procédé pour determiner la charge residuelle d'un batterie et arrangement pour surveiller une batterie - Google Patents

Procédé pour determiner la charge residuelle d'un batterie et arrangement pour surveiller une batterie Download PDF

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Publication number
EP1394561A1
EP1394561A1 EP03013525A EP03013525A EP1394561A1 EP 1394561 A1 EP1394561 A1 EP 1394561A1 EP 03013525 A EP03013525 A EP 03013525A EP 03013525 A EP03013525 A EP 03013525A EP 1394561 A1 EP1394561 A1 EP 1394561A1
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EP
European Patent Office
Prior art keywords
battery
smoothing
charge
interval
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03013525A
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German (de)
English (en)
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EP1394561B1 (fr
Inventor
Ingo Dipl.-Ing. Koch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Clarios Germany GmbH and Co KGaA
Original Assignee
VB Autobatterie GmbH and Co KGaA
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Application filed by VB Autobatterie GmbH and Co KGaA filed Critical VB Autobatterie GmbH and Co KGaA
Publication of EP1394561A1 publication Critical patent/EP1394561A1/fr
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Publication of EP1394561B1 publication Critical patent/EP1394561B1/fr
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements

Definitions

  • the invention relates to a method for determining the amount of charge that can be removed a storage battery and a monitoring device for a Storage battery with measuring equipment for measuring battery voltages and battery currents and with evaluation means.
  • DE 694 23 918 T2 describes a device for displaying the degree of emptying described a battery in which periodically measured values z. B. of open circuit voltage or internal impedance can be detected. These measurements are over filtered a low pass and determined the mean of it. If the mean a drain warning display is generated if a threshold value is exceeded.
  • DE 691 31 276 T2 describes an electronic tester for evaluating the percentages Energy capacity of a battery or a battery cell disclosed.
  • the dynamic master value is determined and becomes a reference master value related to the dynamic conductance of a battery or Battery cell with 100 percent capacity corresponds.
  • Is z. B. determines the state of charge of a storage battery by measuring the quiescent voltage, as z. B. is possible with a lead-acid battery, so this value can not be used to make a statement about the amount of charge Q R from the fully charged storage battery when it is no longer in new condition.
  • the reason for this is that although in this case the state of charge is a measure of the amount of charge that can be removed from the acid, the amount of charge that can still be removed from the active mass only correlates with the amount of charge in the acid when new.
  • the state of charge according to these definitions therefore gives no information about the amount of charge Q R that can actually be drawn from a used storage battery.
  • U.S. Patents 5,721,688 and 5,572,136 disclose devices and methods known in which a relatively small time-varying current of a storage battery imprinted and the time-dependent voltage response of the storage battery is observed and evaluated. From the tension response, the Conductivity of the storage battery can be determined. However, it is not in operation Always possible and desirable to apply a separate measuring current.
  • the object of the invention was therefore to provide an improved method for determining the amount of charge Q R that can be drawn from a storage battery in the fully charged state and a monitoring device for a storage battery with which the amount of charge Q R that can be removed from a used storage battery can be determined as precisely as possible using simple means.
  • the smoothing is preferably carried out by filtering with time constants, by averaging, especially the moving average, or the like.
  • the calculated characteristic values are preferably an average value as an interval characteristic value calculated.
  • the mean can also be a moving average or Median etc.
  • One condition can be that the magnitude of the current difference ⁇ l 23 (t) is less than a defined second limit value.
  • a further condition may be that the magnitude of the current difference ⁇ l 12 (t) of the battery current smoothed with the second smoothing measure and of the battery current smoothed with a first smoothing measure is smaller than a defined first limit value, the first smoothing measure being greater smoothing than the second smoothing measure.
  • the second smoothing measure smoothed battery currents greater than a third limit and less than a fourth limit.
  • the magnitude of the current difference ⁇ l 23 (t) is greater than a defined fifth limit value and / or the magnitude of the current difference ⁇ l 12 (t) of the battery current filtered with the second time constant and the battery current filtered with a first time constant than a set sixth limit.
  • the first and second limit values are preferably in a range of 30 hours up to 80 hours of current and preferably corresponds to about 50 hours Electricity.
  • the third limit value preferably corresponds approximately to the 10-hour one Current and the fourth limit is about the 30 hour current, where a tolerance of about 50% still leads to comparable results.
  • the permissible characteristic values that are mentioned above Fulfill conditions be integrated in a time interval.
  • the times, in which permissible characteristic values are available are also integrated to a To calculate the duration of the time interval.
  • the interval characteristic value is then as a quotient from that calculated by integrating the permissible parameters integrated characteristic of the time interval and the duration of the time interval calculated.
  • the interval characteristic values are preferably dependent on the operating state of the storage battery weighted. For example, for unloading the storage battery different weighting factors than for charging be provided.
  • a measure J is then determined from an interval characteristic value State of charge and a measured battery temperature and from the learned New condition interval characteristic value for the determined state of charge and the measured battery temperature.
  • the amount of charge that can be removed is then dependent on the dimension J and the state of charge and the battery temperature determined.
  • the interval parameters are thus related to New condition interval characteristic values evaluated.
  • the measure J can for example be the difference or the ratio of that Interval characteristic value and the new condition interval characteristic value.
  • the battery voltage U (t) and the battery current l (t) are measured with a suitable temporal resolution of preferably less than 1 s and the battery voltage values U (t) and the battery current values l (t) are measured, for example, with at least two low-pass filters with different time constants ⁇ smoothed.
  • a second time constant ⁇ 2 should be smaller than a third time constant ⁇ 3 .
  • the smoothing can also be carried out by averaging, for example moving averaging over different time windows, or the like.
  • FIG. 1 shows corresponding battery current profiles smoothed with different time constants ⁇ .
  • Voltage differences ⁇ U 23 (t) are then calculated for each time interval from the difference between the battery voltages U (t) filtered with the second time constant ⁇ 2 and the battery voltages U (t) filtered with the third time constant ⁇ 3 .
  • the current differences ⁇ l 23 (t) are calculated from the difference between the battery currents l (t) filtered with the second time constant ⁇ 2 and the battery currents U (t) filtered with the third time constant ⁇ 3 .
  • a characteristic value K (t) is then calculated as a function of time, limited to the time intervals ⁇ t.
  • An interval characteristic value Km is then calculated from the characteristic values K (t) of a respective time interval ⁇ t, preferably by averaging, and the amount of charge Q R that can be drawn is determined as a function of the interval characteristic value Km.
  • the amount of the current difference ⁇ l 23 (t) is greater than a defined fifth limit value l limit5 and the amount of the current difference ⁇ l 12 (t) is greater than a defined sixth limit value l limit6 .
  • the conditions can be expressed by the following equation: I grenz5 ⁇ I ⁇ 3 (T) -I ⁇ 2 (T) ⁇ I limit2 I grenz6 ⁇ I ⁇ 2 (T) -I ⁇ 1 (T) ⁇ l limit1 I grenz3 ⁇ I ⁇ 2 (t) ⁇ I grenz4
  • FIG. 1 shows a diagram of battery current values I (t) smoothed with a first time constant ⁇ 1 , a second time constant ⁇ 2 and a third time constant ⁇ 3 over time with defined limit values I limit1 , I limit2 , I limit3 and I limit4 . It becomes clear that by defining the limit values, the key figure K is essentially only carried out in the middle and rear area of the first decaying edge of the current pulse, since the limit value conditions are only met there.
  • FIG. 2 shows a possible flow diagram for the method according to the invention for determining the amount of charge Q R that can be drawn. The evaluation is limited to the times in which the battery is discharged.
  • the battery currents l (t) are filtered with three low-pass filters with different time constants ⁇ 1 , ⁇ 2 , ⁇ 3 . It is checked whether the filtered current value l ⁇ 1 (t), l ⁇ 2 (t), l ⁇ 3 (t) fulfills the conditions described above, ie that I ⁇ 1 - I ⁇ 2 ⁇ I limit1 . I ⁇ 2 - I ⁇ 3 ⁇ l limit2 . l grenz3 ⁇ l ⁇ 2 ⁇ l grenz4 . l ⁇ 2 ⁇ 0 is.
  • the interval characteristic value Km is preferably evaluated as a function of the state of charge SOC and the battery temperature T Bat and the amount of charge Q R that can be drawn is determined.
  • the amount of charge Q R that can be removed can be determined with the aid of predetermined empirically or arithmetically determined characteristic diagrams as a function of the state of charge SOC and the battery temperature T Bat .
  • the characteristic value K (t) is also possible to correct the characteristic value K (t) accordingly. It also makes sense to weight the characteristic value K (t) as a function of the operating situation of the storage battery. For example, time intervals .DELTA.t in which the storage battery is charged can be weighted differently than time intervals .DELTA.t in which the battery is discharged.
  • a new value interval characteristic value Km new is preferably determined as a function of charge states SOC and battery temperatures T Bat and recorded as a characteristic value. The determination can be made by teaching a map.
  • a measure J is then determined from the difference or the ratio of the interval characteristic value Km and the new value interval characteristic value Km new for the respectively present charge states SOC and battery temperatures T Bat .
  • the new value interval characteristic values Km new are thus compared with the determined interval characteristic values Km with the same state of charge SOC and battery temperature T Bat .
  • the amount of charge Q R that can be removed is then determined as a function of the state of charge SOC, the battery temperature T Bat and the dimension J, for example with the aid of characteristic diagrams.
  • FIG. 3 shows a diagram of a starter battery with 70 Ah of the removable amount of charge Q R plotted over the characteristic value Km as a function of the battery temperature T Bat of 0 ° and 25 °.
  • the state of charge SOC is 70%.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Tests Of Electric Status Of Batteries (AREA)
EP03013525A 2002-08-31 2003-06-13 Procédé pour déterminer la charge résiduelle d'une batterie et arrangement pour surveiller une batterie Expired - Lifetime EP1394561B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10240329A DE10240329B4 (de) 2002-08-31 2002-08-31 Verfahren zur Ermittlung der einer vollgeladenen Speicherbatterie entnehmbaren Ladungsmenge einer Speicherbatterie und Überwachungseinrichtung für eine Speicherbatterie
DE10240329 2002-08-31

Publications (2)

Publication Number Publication Date
EP1394561A1 true EP1394561A1 (fr) 2004-03-03
EP1394561B1 EP1394561B1 (fr) 2010-08-18

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EP03013525A Expired - Lifetime EP1394561B1 (fr) 2002-08-31 2003-06-13 Procédé pour déterminer la charge résiduelle d'une batterie et arrangement pour surveiller une batterie

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Country Link
US (1) US6967466B2 (fr)
EP (1) EP1394561B1 (fr)
AT (1) ATE478350T1 (fr)
DE (2) DE10240329B4 (fr)
ES (1) ES2347225T3 (fr)

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EP1394561B1 (fr) 2010-08-18
ATE478350T1 (de) 2010-09-15
US20040189255A1 (en) 2004-09-30
DE10240329A1 (de) 2004-03-11
ES2347225T3 (es) 2010-10-27
US6967466B2 (en) 2005-11-22
DE50312991D1 (de) 2010-09-30
DE10240329B4 (de) 2009-09-24

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